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Isogeometric analysis for postbuckling of sandwich cylindrical shell panels with graphene platelet reinforced functionally graded porous core

机译：具有石墨烯血小板的夹层圆柱形壳板的异构分析，用石墨烯血小板增强功能梯度多孔芯

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摘要

The proposed work investigates for the first time the postbuckling behavior of sandwich cylindrical shell panels with two metallic face layers and a graphene platelet (GPL) reinforced functionally graded porous (FGP) core subjected to central point loads, uniform and non-uniform pressure loadings. Based on a general higher-order shear deformation shell theory and the von Karman large deflection assumption, the discrete equilibrium equations of the sandwich cylindrical panels are established by the principle of virtual work. The NURBS (nonuniform rational B-spline) based isogeometric analysis (IGA) in conjunction with the modified arc-length method of Crisfield are utilized synthetically to acquire nonlinear load-deflection responses for the panels numerically and both snap-through and snap-back types of instability are captured. Several benchmarks are carried out to verify accuracy and reliability of IGA and arc-length method in present formulation. Parametric studies are performed to demonstrate the influences of weight fraction of the graphene platelet, porosity distribution, porosity coefficient and thickness of the sandwich core on the nonlinear load-deflection responses of the sandwich cylindrical panels. Some complex load-deflection curves of the FGP-GPL cylindrical panels may be useful for future references.
机译：该拟议的工作首次调查了夹层圆柱形壳板的夹带行为，具有两个金属面部层和石墨烯血小板（GPL）加强功能梯度的多孔多孔（FGP）芯，经受中央点载荷，均匀和不均匀的压力载荷。基于一般的高阶剪切变形壳理论和von Karman大的偏转假设，通过虚拟工作原理建立了夹层圆柱板的离散平衡方程。基于NURBS（非均匀性B样条曲线）的异诊测分析（IGA）与CRISFIELD的改进的弧长方法一起使用，以便在数值上和卡扣和卷回类型的基础上获取面板的非线性载荷偏转响应捕获不稳定。进行了几个基准，以验证IGA的准确性和可靠性和当前制定中的弧长方法。进行参数研究以证明石墨烯血小板，孔隙率，孔隙率系数和夹层芯的厚度和厚度的影响在夹层圆柱板的非线性载荷偏转响应上的影响。 FGP-GPL圆柱形面板的一些复合载荷偏转曲线对于未来的参考可能是有用的。

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